Inkdoku: Sudoku with Hints

Inkdoku is a calm, classic sudoku. Pen for answers, pencil for notes, and hints that teach you the logic instead of just filling in a number. ★ No pop-ups mid-puzzle Full-screen ads only appear between games, never while you are solving or using a hint. A small banner stays at the bottom, away from the number keys. ★ Hints that explain why Stuck? Tap Hint and Inkdoku shows the next logical step and tells you why it works: "only one spot in this box", "only one number fits this cell", locked candidates and naked pairs. Learn the technique, then use it yourself. ★ Every puzzle has one solution Each sudoku puzzle is built by a logic solver, so there is exactly one answer and you never have to guess. Five levels, from Easy to Master, graded by the techniques you need. ★ A new daily puzzle every morning Solve today's sudoku to grow your streak. A monthly calendar shows every day you played. ★ Think it through Wrong numbers are not marked in red by default, so you solve with your own logic. Want instant checking? Turn it on in Settings. Features • 9×9 classic sudoku in 5 levels: Easy, Medium, Hard, Expert, Master • Daily sudoku with streaks and a calendar • Pencil notes with auto-clear when you write a number • Undo, erase and step-by-step hints • Highlights for the row, column, box and matching numbers (can be turned off) • Larger numbers option for easy reading • Timer you can hide, best and average times per level • Light and dark themes • Home screen widget for today's puzzle • Works offline, no account, your games stay on your phone Whether you want a five-minute brain break with your coffee or an expert logic puzzle before bed, there is a board for you.